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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Sep. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Weighted Average Assumptions for all Options Granted Estimated at Grant Date Using Black-Scholes-Merton Option-Pricing Model | The fair value of the Company’s employee stock options was estimated at the date of grant or modification using a Black-Scholes option-pricing model with the following weighted average assumptions for all options granted during the fiscal years ended:
| Fiscal Years Ended September 30,
| 2024 |  | 2023 |  | 2022
Risk-free interest rate | 4.14% to 4.68% |  | 3.45% to 4.20% |  | 1.47% to 2.97%
Expected life of options | 6.5 years |  | 6.5 years |  | 6.5 years
Expected dividend yield of stock | — |  | — |  | —
Expected volatility of stock | 33.5% |  | 32.5% |  | 37.0% to 38.0%
Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity | The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024:
| Number of Options |  | Weighted-Average Exercise Price Per Option |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at September 30, 2023 | 223,945 |  |  | $ | 627.81 |  |  |  |  |
Granted | 398,729 |  |  | 889.08 |  |  |  |  |
Exercised | (3,521) |  |  | 631.12 |  |  |  |  |
Forfeited | (58,044) |  |  | 792.32 |  |  |  |  |
Expired | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2024 | 561,109 |  |  | $ | 795.95 |  |  | 8.8 years |  | $ | 354,160,779 |
Expected to vest | 309,408 |  |  | $ | 833.09 |  |  | 8.9 years |  | $ | 183,800,728 |
Exercisable at September 30, 2024 | 120,116 |  |  | $ | 712.29 |  |  | 8.5 years |  | $ | 85,863,473 |
The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024:
| Number of Options |  | Weighted-Average Exercise Price Per Option |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at September 30, 2023 | 4,246,321 |  |  | $ | 443.02 |  |  |  |  |
Granted | 158,550 |  |  | 971.00 |  |  |  |  |
Exercised | (529,387) |  |  | 316.35 |  |  |  |  |
Forfeited | (95,981) |  |  | 611.34 |  |  |  |  |
Expired | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2024 | 3,779,503 |  |  | $ | 466.18 |  |  | 5.2 years |  | $ | 3,631,913,408 |
Expected to vest | 785,057 |  |  | $ | 653.01 |  |  | 7.6 years |  | $ | 607,728,325 |
Exercisable at September 30, 2024 | 2,892,840 |  |  | $ | 390.75 |  |  | 4.5 years |  | $ | 2,998,078,391 |
The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024:
| Number of Options |  | Weighted-Average Exercise Price Per Option |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at September 30, 2023 | 450,192 |  |  | $ | 211.49 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (375,977) |  |  | 199.71 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Expired | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2024 | 74,215 |  |  | $ | 226.34 |  |  | 1.1 years |  | $ | 89,116,630 |
Exercisable at September 30, 2024 | 74,215 |  |  | $ | 226.34 |  |  | 1.1 years |  | $ | 89,116,630 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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